ᐅ Divide underground cables into two circuits.

Hi,

when we planned the electrical system, we included a 5-core underground cable as a reserve for the garden. It is intended for future garden lighting and power supply. The cable comes out roughly in the middle of the property, under the terrace.

I’m not looking for advice on how to properly connect the cable—that will be done by professionals.

But for my further garden planning, I have the following questions:

• Can I split this cable into two independent circuits? There is a simple switch inside that is already planned for this purpose. It could later be replaced with a double switch to control each circuit separately.
• Can I then run one circuit to the left side of the garden and the other to the right side? What happens to the green/yellow PE (protective earth) conductor in this case?

laley schrieb:

Can I split this cable into two separate circuits?

With the 5-core cable, you can create three circuits. We don’t need to answer the other questions since a professional will handle the installation.

Thank you for the quick response.
However, it only answers some of my questions.

Can I physically split the cable now?
Can I run 2 conductors to the left side of the garden and 2 conductors to the right side?
Which pairs of conductors would I use in that case?

I understand that, as a layperson, I am allowed to do this myself.
Especially since the cable and the switch are, of course, not yet connected in the electrical distribution panel.

laley schrieb:

I’m not looking for advice on how to connect the cable correctly here; I’ll leave that to the professionals.

Do you want advice now or not?

laley schrieb:

Can I spatially separate the wiring?
Run 2 conductors to the left side of the garden and 2 conductors to the right side of the garden?
Which conductor pairs should I use then?

Yes, you can. You need to measure to identify which conductor is which.
Typically, brown, black, and gray are phases 1 to 3, blue is the neutral conductor, and yellow/green is the protective earth. So, use one phase per circuit along with the neutral and protective earth conductors.

Before you split this further, you can install a distribution box and then continue with 3-core underground cables.

Joedreck schrieb:

Before you split this further, you can install a junction box and then continue with 3-core ground cables.

Use a Friedl box for the grounding. It is completely waterproof and has enough space to distribute your three cables further and bury it deep underground.